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diff --git a/ReferenceCode/RapidStart/Smm/x64/RapidStartAsm.asm b/ReferenceCode/RapidStart/Smm/x64/RapidStartAsm.asm
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+++ b/ReferenceCode/RapidStart/Smm/x64/RapidStartAsm.asm
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+;
+; This file contains an 'Intel Peripheral Driver' and is
+; licensed for Intel CPUs and chipsets under the terms of your
+; license agreement with Intel or your vendor.  This file may
+; be modified by the user, subject to additional terms of the
+; license agreement
+;
+  page    ,132
+  title   RapidStart ARCHITECTURAL SMM ASSEMBLY HOOKS
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2005 -2012 Intel Corporation. All rights reserved
+; This software and associated documentation (if any) is furnished
+; under a license and may only be used or copied in accordance
+; with the terms of the license. Except as permitted by such
+; license, no part of this software or documentation may be
+; reproduced, stored in a retrieval system, or transmitted in any
+; form or by any means without the express written consent of
+; Intel Corporation.
+;
+; Module Name:
+;
+;   RapidStartAsm.asm
+;
+; Abstract:
+;
+;   Assembly code of the implementation of X64 RapidStart
+;
+;------------------------------------------------------------------------------
+
+text  SEGMENT
+
+;------------------------------------------------------------------------------
+;  UINT64
+;  ScanValueMem64 (
+;    VOID*   BaseAddress,
+;    UINT64  PageSize,
+;    UINT64  Index
+;    )
+;------------------------------------------------------------------------------
+ScanValueMem64    PROC    USES    rbx rsi rdi
+   xor     rsi, rsi
+    dec     rsi
+    mov     rdi, rcx
+    mov     rax, r8
+    mov     rcx, rdx
+    repe    scasq
+    mov    rax, rsi
+    lea     rbx, [rdi - 8]
+    cmovne  rax, rbx
+    ret
+ScanValueMem64    ENDP
+
+text  ENDS
+END
+